Sorry I can't answer your question directly but a good rule of thumb for any game with this type of questioning is if you feel the need to ask the question then chances are no it's not allowed or may get caught by their internal scanners as some sort of exploiting program. ToS even sometimes can be a bit grey in games.

Yes it exists and yes you will be banned if you get caught. It's not called zoom unlocker but zoom hack, and it gets extensively exploited by many guilds in top tier matchups to fire with arrow carts where you normally can't.